Abstract
Ordered intermetallic alloys based on the stoichiometric iron aluminide compositions of Fe 3Al and FeAl are being actively considered for high-temperature structural applications. They exhibit poor room temperature ductilities due to hydrogen embrittlement. Surface passive films reduce embrittlement by lowering the rate of hydrogen liberation on the surface. This has been explained by the mixed potential theory. The mechanism of hydrogen embrittlement in iron aluminides (namely, decohesion) has been addressed. Methods to minimize the degree of embrittlement have been discussed. These include passivity induction, addition of oxygen active elements, recrystallization inhibition and addition of irreversible hydrogen traps. The diffusion of hydrogen in iron aluminides has also been reviewed.
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